Adding flask and heartbeat

tests/test_heartbeat.py

@@ -0,0 +1,21 @@
+import pytest
+from src.app import app
+
+
+@pytest.fixture
+def client():
+    app.config["TESTING"] = True
+    with app.test_client() as client:
+        yield client
+
+
+def test_heartbeat_status_code(client):
+    response = client.get("/heartbeat")
+    assert response.status_code == 200
+
+
+def test_heartbeat_payload(client):
+    response = client.get("/heartbeat")
+    data = response.get_json()
+    assert data["status"] == "ok"
+    assert "timestamp" in data